Guard for presses



June 16, 1931 c. E..MARSHALL GUARD FORPRESSES Filed June '7, 1929Patented June- 16, 1931.

cnm'roiv n; ivninsnntn or BRooKnYN, Iii-w YORK i f GUARD non ."PR-nssns7 iApplicatio'n filed me 7, 1929. Serial no; 369,102.

This inventionrelates to presses of various kinds and classes andparticularly to What are known asfoot presses-,- and to theprovision ofa guard in operative engagement with theplunger OfTthQ PIGSS whereby theguard element may be moved with respect to the dies to forcefully removea'finger orhand from the path of the dies to prevent injury thereto; andthe object-of the invention is it to provide a guard oftheclass a'ndforthe purpose specified in. the form of an -attach- V 1nent.which may'bequickly and "easily.

applied to and coupledwith presses of cone ventional form; afurther:objectfbeing to provide a guard attachment of the class specified which is soconstructedasto permit the adjustment of the partsthereof to adapt the same tomanyuses or to difi-erent kinds and classesof dies used 111 thepresses; and wlth' these and other ob ects inview,the lnvention consists in a guard attachment 'of the class and for thepurposespecified which is simple in construction, efficient inuse; andwhich is constructed as hereinafter "described and position with respecttotlie frame and also 5 to clear the outer face of the plunger l1,"th'e-The invention is fully disclosed in the fol- 1 lowing specification; ofwh'ich the accompanying drawings-form a part, in which the separateparts of myimprovement are designatedbysuitable reference characters ineach of the views, and in which 7 5 Fig. 1 is a front view of a part ofa foot press showing one form of .attachment mounted in connectiontherewith and indieating the method of its user H Fig. 2 is a side viewof the structure in Fig;1.- I a shown Fig. 3 is a view similar to :Fig.1 but show-'- ing a modification. I

Fig. i is a side view of the structureshown in Fig. 3,'and,. l; p 5 is a'side'view' of a press similar to that SllOWIl lIl Figs. 1' and 2,illustrating another arrangement of attachment thereon My inventionrelates to guard attachments" for presses of various kinds and classes,and

for the purpose-of illustrating one use of invention, I havedia'graimmatlcally shown n the accompany ng. draw ngs; portions of a lfoot press of conventional form and like references will designate likeparts of the press in the several figures. Apart ofthe'bodyI portion orframe of the press is'indicated at 10 in the several figures, and 11represents a vertically movable 'plunger,, 12 the plunger die; 13 thebedOr -table ofthe press upon which is the lower or stationary die block14 it being'und-erstood at this time that the'dies. 12and 1% maybe ofany desired form and 1 construction.

In Figs. 1 and2 of the drawings,-I"have shown one form of attachmentwhich consists in a bar or strip "15 secured to the upper end portion ofthe plunger llby screwsor other means 16 and projecting at one side ofthe press, the free end portion having a P vertical aperture to receivea connecting rod or operating arm 17, the upper end of whichisadjustably fixed to the bar 15 by-a set screw or other means 18. Alever19is'pivotally supported in connection-with the frame 10'o n apivotscrew20, a spacing member 21 being preferably employed'inwardly ofthe;

leverso as to, arrangethe same in proper- 5 The long ,arm119b' of thelever 19 projects L outwardly at the side of the press and the 7 lowerofiset'po'rtion 17a of the connecting rod 17 rests upon. and cooperateswith said end of the lever to control-the operation of the guard arm 22*A spring 24. is preferably coupled with theend 1960f the lever and withthe-j frame 10 to holdthe end-19b of theleverin engagement with the rod17 at all times. I

.A guard arm 22 as seen from the front of the machine, is ofi'setoutwardly, downwards" ly and-inwardly and is arrangedto move over theupper face of the die block 14',- and thefend portion ofsaidarm has aninwardly 05;) directed extensio'ri22d, note Fig; 2,- which-is arrangedto pass-directly in frontof but clear- 1 ing the die 12. Thenormal'position of the parts of the attachment is shown in full linsiii-Fig. lwhen'the plunger is in raised" 1 finger of a hand which isindicated in dotted .lines at 25 should the same be'in the path of saidarm.

This type of attachment is designed primarily for use in stamping orforming workpieces wherein it iscustomary and necessary to leave onefinger of the hand upon the die 14 to support the workpiece in properposition, and my improved guard device will insure the'removal of thefinger of a hand, preventing injury thereto, should the finger have beenmisplaced in the path of the guard or the plunger die. At this time, itwill be understood that the lower end portion of the arm 22 may be bentor fashioned to suit any type, kind or class of dies and workpiecesrequiring support by one or more fingers of the hand during the pressoperation.

In many uses of presses of the class under consideratiomall that will benecessary will be to move a guard arm transversely with respect to thefront of the two dies employed in the machine, so as to remove a fingeror head should it accidentally beleft in the path of the dies, andespecially the plunger die.

InFigs. 3 and 4 of the drawings, I have shown a form of constructionsuitable for this purpose. In this construction, Iemploy a bar 26similar to the bar 15 and which is secured to the plunger--11, and tothe outer end of which is adjustably secured a connecting rod 27operating upon the outer end ofa lever 28 pivoted to the frame 10 asseen at 29, a spring 30 being arranged between the outer end of thelever and the bar 26 to support the lever28 constantly in engagementwith the connecting rod 27. a

A guard arm 31 is adjustably secured to the inner end of the lever 28and extends outwardly, downwardly and inwardly as seen in Fig. 4 of thedrawings, the arm normally assuming the position shown in Fig. 3 of thedrawings and being adapted to be moved to the right across the verticalcenter of the dies 12 and 14 in the same manner as the movement of thearm 22so as to remove a finger or hand which may be arranged in the pathof movementof said guard arm, it being seen that'the arm 31 extendsbelow the die 14 instead of working over the upper surface. of said dieas in the construction shown in Figs. 1 and 2 of the drawings.

In Fig. 5 of the drawings, I have shown another vmodification whichconsists primarily in arranging the lever and guard arm at one side ofthe machine rather than at the front thereof so as to control and insurethe removal of a finger or hand'whenit is essen tial to feed the workinto the dies from one side of the machine rather than at the front ofthe machine. In this construction, a connecting rod 32 is employed andcoupled with a bar similar to the bar 15 or 26 and is offset backwardlyand downwardly at one side of the machine to engage the backwardlydirected end of a lever 33 pivoted to the frame 10 as seen at 34, aspring 35 being employed to support the lever 33 in engagement with theconnecting rod 32; and a guard arm 36 is adjustably sup orted inconnection with the forward end of the lever and extends backwardly anddownwardly, the lower end of said arm being normally arranged rearwardlyof the lower die 14 to permit the free feeding of a workpiece into thedie from the side of the press. In the descent of the plunger, the guardarm 36 will move forwardly and across the vertical central path of theplunger die 12 at the side thereof.

From the foregoing, it will be apparent that in the several forms ofconstruction shown, three distinct elements are employed in theattachment, namely thelever to one end of which is adjust-ably securedthe guard arm, and the connecting rod operatabl engaging the, other endof the lever an adjustably coupled with the plunger so that the downwardmovement of the plunger will impart predetermined movement to the uardarm with respect to the dies supported in the press to insure theremoval of a finger V or hand to prevent accident or injury thereto.

construction, the attachment may be coupled with and incorporated as apart of the press at a nominal cost and further by virtue of theadjustments provided for the connecting rod and guard arm, the same maybe adapted to machines of different kinds and classes and to cooperatewith dies of different shapes and forms.

It will be understood that the guard arm of the several attachmentsshown will operate to engage and remove a finger or. hand prior to thecompletedescent of the plunger, and will be so timed as to insure theremoval of a finger or hand before the same can be caught between theplunger die and stationary die. I

'At this time, it will also be apparent that my invention is notnecessarily limited to any particular shape or form of the connectingrod, and. guard arm employed, the same being constructed of rod-likematerial preferably of a texture which will permit the bending andshaping thereof as well as the rebending and reshaping without danger ofbreaking the same. While I have showncertain uses of my invention aswell as specific structural 7 details of theseveral parts of theattachment,

it will be understood that I am not necessarily limited in theserespects and various other changes in and modifications of the 0011-struction herein shown and described may be 1 made within the scope ofthe appended claims without departin from the spirit of my invention orsacrii oing its advantages.

Having fully described my lnv-ention, what I claim as new and desire tosecure by Let-1 ters Patent, is

1. A guard attachment for presses comprising a part adapted to becoupled with the, plunger of the press, a lever pivoted to the lower endof the frame of the press above the bed plate thereof, a guard armadjustably supported in connection with one end of said" lever andhaving an offset portion arranged to move lZIfiIlSVBI'SElY'Wltll respectto and adjacent the front of the plunger die of the maintaining said endof the lever in constant engagement with said rod.

2.,A guard attachment for presses comprising a part adapted to becoupled with the plunger of the press, alever pivotedto" the lower endofthe frame of the press above the bed plate thereof, a guard armadjustably supported in connection with one end of said lever and havingan, offset portion arranged to move transversely with respect to and adjacent the front of'theplunger die of the press, an operating rodadjustably coupled with said part and extending from said part I Itransversely wlth respect to the front of the to said lever and bearingupon the other end of said lever to transmit movement to said guard armin the descent of the plunger, tensional means coupled with said frameand with the last named end of said lever for maintaining said end ofthe lever in constant engagement with said rod, and the lower end aportion of said rod beingoft'set to dispose the end thereof'engagingsaid lever at an inclination thereto when'the plunger of the press is inraised position.

3. A guard attachment for presses comprising two independent andcooperating units, one of said units being supported in connection withthe plunger of the press and the other in connection with the frame ofthe press adjacent the lower end of the plunger, said first named unitcomprising a baratshort end portion of said lever and arranged to movetransversely with respect to, the plunger die adjacent the die plate ofthe press and the lower end portion of said rod abutting the long end ofsaid lever, and tensional meanscoupled with the long end of said leverformaintaining the same in constant engagement with the lower end ofsaid rod whereby in the descent of said plunger, said guard arm will bemoved transversely of the front of the plunger die of the press.

4. A guard attachment for presses comunits,'one of said units beingsupported in connection with the plunger of the press and prising twoindependent and cooperating i the other in. connection with the frame ofthe press adjacent the lower end of the plunger, said first named unitcomprisinga bar attached to the plunger and projecting at one side ofthe press, and a rod adjustably supported in connection'with said barand eX- tending downwardly, another unit, comprisnga lever p-ivotallysupported to the frame,

said lever having a long endportion and a a relatively short endportion, a guard armed justably supported in connection with the shortend portion of said lever and arranged to move transversely with respectto the plunger die adjacent the die plate of the press and the lower endportion of said rod abuttingthe long end of said lever, tensionalfguardarm will be moved transversely of the front of the plunger die ofthe press, and the lower end portions of said rod and arm being offsetoutwardly and inwardly in a plane press.

In testimony that I claim the foregoing as my invention Ihave signed myname this 18th day of May, 1929.

CLINTON E. MARSHALL.

ice

tached to the plunger and projecting at one side of the press, and a rodadjustably supported in connection with said bar and extendingdownwardly, another unit comprising a lever pivotally supported to theframe, said lever having along end portionand a relatively short endportion, a guard arm ad-, w justably supported in connection with the

